<template>
  <div class="SonA">
    我是SonA组件
    <GrandSon />
  </div>
</template>

<script>
import GrandSon from './GrandSon.vue'

export default {
  components: { GrandSon }
}
</script>

<style>
.SonA {
  border: 3px solid #000;
  border-radius: 6px;
  margin: 10px;
  height: 200px;
}
</style>